A Met Office spokesman said: "As Storm Callum passes to the northwest of the United Kingdom, a period of heavy rain will affect South Wales during Friday, with further spells of persistent and heavy rain at times during Saturday".

There is a chance that homes and businesses could be flooded, causing damage to some buildings.

There is a wind warning in place from 3am to midnight on Friday, which covers Northern Ireland and parts of Western Scotland and warns of gusts of 50 to 60 miles per hour in some places, with the potential for gusts of 70 miles per hour around exposed coasts and hills.

The Met Office is also warning of possible disruption to transport services.

The Met Office said 50-60mph gusts were likely on Friday "with the potential for gusts of 70-80mph around exposed coasts and hills".

Very strong winds are predicted, making driving conditions hazardous, especially for the more vulnerable road users, e.g. cyclists, pedestrians, motorcyclists and high sided vehicles.

Richard Brown, Pembrokeshire County Council's Head of Environmental Services and Public Protection, said that although Council staff would be working continuously to clear the roads, motorists would need to be vigilant.

After the worst of the wind has swept the country, the tail-end of Hurricane Leslie will bring rainfall, raising the prospect of coastal and river flooding.

The national forecaster said a band of stormy weather will bring a risk of coastal flooding to the west of the country, while a separate area of low pressure could bring heavy rainfall to the east at the weekend. There will also be spells of heavy rain, high tides and coastal flooding.

Arriva Trains Wales is planning to shut the line between 7am and 11am on Friday morning and in the evening.

It is because the storm is likely to coincide with high tides around the south Wales coast.

It means an increased likelihood of travel delays, road and rail closures, power cuts and potential risks to life and property.

South Wales is bracing itself for a two-day deluge that's expected to cause flash floods and travel chaos.

Conor Faughnan, AA Director of Consumer Affairs said: "It's vital that we all take a look at our own road behaviour and adapt it accordingly to minimise incidents during this weather".

"We are advising people to avoid coastal areas during this event". On Saturday the rain could become even heavier.